I found it interesting that Tyler has been singing, "Leave me alone" throughout the entire song, then says, "don't leave me alone."
At first, I thought Tyler was talking to his demons, but that doesn't explain the very last part. I therefore came to the conclusion that Tyler is talking to God. At some point in his life, maybe, he went through a period of spiritual struggle, where he is both doubting and believing. By the end of the song, Tyler changes to "Don't leave me alone!" meaning he in reality doesn't want to handle his demons on his own.